Refactor code structure for improved readability and maintainability

diagrams/backend/backend2.puml

@@ -0,0 +1,62 @@
+@startuml Architecture MVC
+
+package "Controllers" {
+  [ProjectController]
+  [MeasurementController]
+  [VideoController]
+  [ImageController]
+  [CameraController]
+}
+
+package "Models" {
+  [Project]
+  [Measurement]
+  [Video]
+  [Camera]
+  [DatabaseManager]
+}
+
+package "Routes" {
+  [projectRoutes]
+  [measurementRoutes]
+  [videoRoutes]
+  [imageRoutes]
+  [cameraRoutes]
+  [index]
+}
+
+package "Services" {
+  [StorageService]
+  [VideoService]
+}
+
+package "Utils" {
+  [errorHandler]
+}
+
+package "Database" {
+  [connection]
+}
+
+package "Config" {
+  [config]
+}
+
+cloud "Client" {
+  [Frontend]
+}
+
+[Frontend] --> [Routes]
+[Routes] --> [Controllers]
+[Controllers] --> [Models]
+[Controllers] --> [Services]
+[Models] --> [Database]
+[Services] --> [Models]
+[Controllers] --> [Utils]
+[Models] --> [Utils]
+[Services] --> [Utils]
+[Models] --> [Config]
+[Services] --> [Config]
+[Controllers] --> [Config]
+
+@enduml